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\begin{figure}[htbp]
\ifthenelse{\equal{IJMPB}{\TschStyle}}{%
\centerline{\psfig{file=PictureLarge_nb021_.eps,width=5.00in}}
}{}%
\ifthenelse{\equal{arXiv}{\TschStyle}}{%
\centerline{\includegraphics[scale=1.00]{PictureSmall_nb021_.png}}
}{}%
\ifthenelse{\equal{TeX4ht}{\TschStyle}}{%
\centerline{\includegraphics[scale=0.33]{PictureLarge_nb021_.png}}
}{}
\vspace*{8pt}
\caption{Three versions of radiation curve families 
         of the radiation of the ground 
         (as a function
         of the wave number $k$,
         of the frequency $\nu$,
         of the wave length $\lambda$,
         respectively), assuming
         that the Earth is a black radiator.}
\label{Fig:nb021}
\end{figure}
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